我在尝试进行一个基于CNN的项目时遇到了一些问题。当我构建CNN模型时，在第14行的”model.add(Dropout(0.25))”处得到了一个错误。然而，在之前的第9行的”model.add(Dropout(0.25))”处并没有出现错误。能有人告诉我这里的问题是什么吗？为什么会出现这个错误？

 model = Sequential()model.add(Conv2D(32 , kernel_size=(3,3), acitvation ='relu' , padding='same' , input_shape = (28,28,1)))model.add(BatchNormalization())model.add(Conv2D(32,kernel_size=(3,3),activation='relu' , padding='same'))model.add(BatchNormalization())model.add(MaxPool2D(pool_size=(2,2) ,strides=2))model.add(Dropout(0.25))model.add(Conv2D(64,kernel_size=(3,3),activation='relu' , padding='same'))model.add(BatchNormalization())model.add(MaxPool2D(pool_size=(2,2),strides=2,padding='valid')model.add( Dropout(0.25))model.add(Flatten())model.add(Dense(512,activation='relu'))model.add(BatchNormalization())model.add(Dropout(0.25))model.add(Dense(1024,activation='relu'))model.add(BatchNormalization())model.add(Dropout(0.5))             model.add(Dense(10,activation='softmax'))

错误信息如下：

 File "<ipython-input-53-e1c5cf3b08b4>", line 14    model.add( Dropout(0.25))        ^SyntaxError: invalid syntax

回答：

你在上一行忘记加括号了。只需在第13行末尾加上括号即可。

 model = Sequential()        model.add(Conv2D(32 , kernel_size=(3,3), acitvation ='relu' , padding='same' , input_shape = (28,28,1)))    model.add(BatchNormalization())        model.add(Conv2D(32,kernel_size=(3,3),activation='relu' , padding='same'))    model.add(BatchNormalization())    model.add(MaxPool2D(pool_size=(2,2) ,strides=2))    model.add(Dropout(0.25))        model.add(Conv2D(64,kernel_size=(3,3),activation='relu' , padding='same'))    model.add(BatchNormalization())    model.add(MaxPool2D(pool_size=(2,2),strides=2,padding='valid'))    model.add( Dropout(0.25))        model.add(Flatten())        model.add(Dense(512,activation='relu'))    model.add(BatchNormalization())    model.add(Dropout(0.25))        model.add(Dense(1024,activation='relu'))    model.add(BatchNormalization())    model.add(Dropout(0.5))                     model.add(Dense(10,activation='softmax'))